Manly Lagoon Dredging Project - Manly Council - NSW Government

Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah CouncilsA terrestrial field survey, conducted by Warringah Council on 4 January 2010, wasundertaken to support this desktop study. The field survey indicated that the Magenta LillyPilly species was not present at the proposed works site. No plants listed under either theTSC Act or EPBC Act were identified within the proposed works area during the field survey(Warringah Council, 2010). For the full list of plant species recorded at the works site byWarringah Council during field survey see Appendix N.Endangered Ecological CommunitiesVegetation mapping produced by Warringah Council indicated the presence of twoEndangered Ecological Communities (EEC’s) along the banks of Manly Lagoon, in threedistinct sections. These identified EEC’s are Swamp Sclerophyll Forest on CoastalFloodplains and Swamp Oak Floodplain Forest. Both EEC’s are listed under Part 3(Endangered Ecological Communities) in Schedule 1 of the Threatened SpeciesConservation Act 1995 (TSC Act).A planning map provided by Warringah Council, showing the extent and distribution of thesetwo EEC’s, is provided in Figure 5.10 (and Appendix N). On this planning map, SR/N/3indicates Estuarine Reedland, which is part of the Swamp Sclerophyll Forest on CoastalFloodplains EEC, and EC/N/3 indicates Swamp Oak Forest, which is part of the Swamp OakFloodplain Forest EEC.Figure 5.10 indicates four areas of Swamp Sclerophyll Forest on Coastal Floodplains EECin the upper portion of works. Two of these areas are located north of the footbridge betweenNolan and Passmore Reserves, and lie outside the proposed dredging area. Two of theseareas are towards the northern end of the proposed dredging works with one area extendingapproximately 65m along the north bank of the lagoon, and the other extendingapproximately 50m along the south bank of the lagoon. Two out of four of these areas arewithin Nolans Reserve, and may therefore be in close proximity to the area to be utilised fordewatering of the dredged material and establishment of a contractors compound.Figure 5.10 also indicates one larger stretch of Swamp Oak Floodplain Forest EEC,extending approximately 180m along the south bank of the lagoon, near the end ofCampbell Parade. This is in the mid portion of the proposed dredging area.The locations of these EECs (Figure 5.10) were validated through field survey by WarringahCouncil (2010). Warringah Council (2010) also note in their Seven Part Test report inAppendix N that the EEC planning map has not been updated to reflect further occurrencesof EECs in the area. However, the additional areas where EECs were identified around thebanks of the Lagoon within the dredging works area were generally considered to containhighly modified assemblages of EECs and therefore are of lower conservation significance.It should also be noted that these sections of the Lagoon are considered highly disturbedenvironments.No saltmarsh communities have been identified in Manly Lagoon.2 July 2010 Cardno (NSW/ACT) Pty Ltd 74H:\Doc\2010\Reports.2010\Rep2580v4.doc